Holder for electric incandescent lamps.



,483. PATENTED MAR. 2'7, 1906.

P. LEONARD & O. H. JONES. HOLDER FOR ELECTRIC INGANDESCENT LAMPS.

' APPLIOATION FILED FEB.17. 1904.

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UNITED STATES PATENT OEFIOE.

PETER LEONARD AND CHARLES HAROLD JONES, OF GREAT CROSBY,

I NEAR LIVERPOOL, ENGLAND;

HOLDER FOR ELECTRIC INCANDESCEN-T LAMPS.I

Specification of Letters Patent.

Patented March 27, 1906.

Application filed February 17, 1904. Serial No. 193,953.

To all whom it may concern.-

Be it known that we, PETER LEONARD and CHARLES HAROLD JONES, subjects ofthe Kin of Great Britain, and residents of Great Cros y, near Liverpool,in the county of Lancaster, England, (whose post-office addresses are,respectively, 25 Cooks road and 3 Little Crosby road, Great Crosbyaforesaid) have invented certain new and useful Improvements in Holdersfor Electric Incandescent Lamps, (for which application has been made inGreat Britain, No. 14,721, dated July 2, 1903, also No. 4,703, datedFebruary 28, 1903,) of which the following is a s eciication.

his invention is in relation to holders for electric incandescent lamps,more especially for outdoor illumination or in situations where thelamps are subjected to damp or the weather; and the object of theinvention is mainly to facilitate the wiring of thelamps so that therewill be no slack wire and to secure an absolute water-tight orweatherproof connection from the ends of the cable insulation to theglass oi` the lamp.

In the drawings, Figure 1 is a sectional elevation of the lamp-holderand lamp with part of the lamp-board; Fig. 2, a sectional elevation ofthe parts of the lamp-holder separated from each other Fig. 3, a detailsectional view of the plun er and terminal; and Fig. 4 a view, on a smaler scale, of the invention applied to a hangin lamp. Fig. 5 is anenlarged sectional detail view or1 one of the sprin -plungers Re erringiirst to Figs. 1, 2, and 3, the main portion of the holder consists of ashell a, of orcelain or other suitable material, made tubu ar, butprovided with a diaphragm at or near mid-length, which separates it intotwo chambers c and d. The chamber c forms a socket into which the lam-cap e can be inserted, and its lugs f are he d by the bayonetslots g.These bayonet-slots are only on the inside of the shell a and do notallow of the lugs of the lamp to go through to the outside surface.Round the edge of this socket c we place a loose rubber ring or washerh, and i is a threaded ring, of porcelain or other suitable material,which is screwed onto the part a, so as to compress the rubber washer hbetween them and force it against the lamp-cap e all round, so as toproduce a damp-proof joint. When it is desired to renew or remove thedamp, all that is necessary is to unscrew the ring i. In the diaphragm bare holes j, through which the plungers 7c project, so that they and theshell are retained in their proper relative positions. The plug lcarries the spring-plungers k and terminals n, the latter being slottedto receive the wires m, which are slipped into the slots and pinchedtight by the screws rw without the necessity of cuttin the wires. Theinterior of the chamber d o the shell a is so shaped that its plug Zitswithin it and rests against a beveled set-ofi or coned seat o. A packingof rubber or the like, such as p, or washer of any suitable'kind on theplug makes a water-tight jointJ at that end. r is an earthenware tube tospan vthe space between the plug l and the lamp-board s, or if 'anadaptingpiece t is used then it spans the space between the plug andsaid adapting-piece.

Sup osing that a sign-board is to be wired throug from the back, asshown in Fig.- 1, holes u are made in it opposite where each lamp is tobe, and the wires are doubled or looped, as shown, and the bights passedthrough, the wires then passing on to the next in series, and so on.This obviates cutting the wires or of branch wires to each lamp, as thetwo main wires pass into and out again of the 'One of the tubes r abovedescribed is placed over each pair of bights, the ends whereof are firstbared of insulation, as shown at o. An insulating compound-such, forexample, as sealing-waxis filled in the tube r, leaving the bared endsof the bight projectin This may be repeated until all the board 1swired. The plugs Z are then placed over the tops ofthe tubes 'r and theprojecting ends of the bights of the wires inserted in the terminals nand pinched by means of the screws w. The shells a are placed over thewhole and fastened down onto the board by 'screws inserted through theholes This makes a watertight joint at the base end, and when the lampsare placed in their sockets c and the rings i. screwed down awater-tight joint is made at the outer end, and the connection of thelamp-terminals with the leads that supply current to the lamp iscomplete. When the board is wired on its front surface, we provideadapting-pieces t with slots or grooves therein to accommodate thewires.

. It will be noticed that by this invention we chamber and are coupledto the terminals.l

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avoid branch wires and the numerous joints which have hitherto beenusual, and we also avoid any slack wire whatever. The shell beingentirely of white glazed china, there is .no metal-work exposed, andthere is complete protection of cable ends, spring-plungers, terminals,and junction of lamp-cap with its glass, and there is no liability ofelectrical leakage o'r any one sustaining a shock,

y represents holes in the shell a to enable a vshade or reflector to befastened on.

Although our invention is more especially useful for electric signs, itmaybe used in other situations. For instance, it can be used as ahanging-lamp holder, as shown in Fig. 4'. In this case, a is the outershell, as before i, the screwed ring, and 7i the tube at base of theplug Z. The cap z is first threaded onto the pair of bights, the endswhereof are first bared, as shown, and then the tube 1^ is placed on. Aninsulating compound, such as sealing-warms filled into the tube r. Theplug is then placed over the top of tube 1 and the wires pinched in theterminals and the shell a placed over the whole and screwed or other-Wise fastened to the cap z. This makes a water-tight joint. i

Fig. 5 shows the referred construction of the spring-contact This viewshows the contact slidable and hollow and backed by a spring 1d, whichabutsat its opposite end against a hollow screw k2 in the plug. Spring-ycontacts are not broadly new, and this construction is not hereinclaimed.

We declare that what we claim is- 1. A holder for an incandescent lamp,having a hollow shell with a coned seat in its interior, a plug in saidshell, said plug being constructively independent of the lamp andprovided with s ring-contacts, with means for securing the eading-inwires of the circuit, and with a packing which fits snugly in said conedseat and forming a water-tight joint, and means for preventing thedisplacement outwardly of the plug toward the attaching end of theshell.

v 2. An electric incandescent-lamp holder, having a shell, a plug whichfits water-tight into said shell, the spring-plungers carried by saidplug, the leading-in wires, the ring?n in the shell exterior to the plugand embracing said wires, and insulating material which fills said ringabout the wires', said ring being disposedbetween the said plug and theattaching end of the shell.

3. In electric incandescent-lamp holders, the combination with an outertubular shell of earthenware, 'of an earthenware plug insertedthereinto, springlungers and terminals carried by the p ug, theterminals being slotted to receive the leading-in wires and providedwith screws to pinch them tight in the slots, a rubber ring for making awater-ti ht joint between the plug and the hollow s ell, and anearthenware tube placed round the leading-in wires for spanning thespace between the lplug and the lamp board or base, said rin eing filledwith sealingwaX or other insu ating compound.

4. The combination with a lamp board or base, of a hollow lamp holdersecured to said base, leading-in wires having partiallynaked bightswhich project from said base or board into said holder, a ring ofearthenware which fits into said holder about the bights of the wires,and a filling of insulating material in said ring and about the wires,aportion of the naked bights of the wires projecting through and beyondthe fillin in said ring.

In witness whereof we ave hereunto signed our names, this 3d day ofFebruary, 1904, in the presence of two subscribing witnesses.

PETER LEONARD. CHARLES HAROLD JONES. Witnesses:

G. C. DYMOND, JOHN McLAcHLAN.

